Upgrade Setup

We will use the UpgradeBeacon pattern to implement three upgradable contract types: Home, Replica, and GovernanceRouter.

Each upgradable contract will have:

  • Proxy

    • the permanent address of the contract that external entities interact with

    • holds the storage of the contract

    • uses the logic specified by Implementation

    • uses delegatecall to forward contract calls from Proxy → UpgradeBeacon → Implementation

  • UpgradeBeacon

    • stores the (mutable) address of the Implementation

    • forwards delegatecalls to the Implementation

    • accepts new Implementation addresses from its Controller (thereby performing upgrades for all Proxies)

  • Implementation

    • specifies the logic of the contract

    • code is the same as a normal, non-upgradable contract implementation (though it should use upgrade-safe storage)

Each of the three UpgradeBeacon contracts will share a the same Controller — the contract with the power to perform upgrades.

The Controller contract will have two roles: controller and saver.

  • controller

    • is a transferrable role that should be performing upgrades in almost every case.

    • will be set to the GovernanceRouter Proxy, so that the Governance xApp ultimately controls the upgrades of the entire system. Note that this creates a circular dependency which makes upgrades of the GovernanceRouter Implementation particularly sensitive.

  • saver

    • is a transferrable(?) role that is responsible for recovering the system in a catastrophic failure case. Actions performed by the saver will be subject to a timelock enforced by the Controller contract.

    • will be set to a multisig contract where the signatories are a set of known / trusted community members. the signatories for the saver multisig be the same on every chain

Diagrams#

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